Machine for dressing millstones



UNITED sTATEs PATENT OFFICE. y

ELLIOT C. BADGER, OF WARNER, NEIV HAMPSHIRE.

MACHINE FOR DRESSING MILLSTONES.

Specification of Letters Patent No To all whom it may concern Be it known thatv I, ELLIOT C. BADGEE, of Warner, in the county of Merrimack and the State of New Hampshire, have invented certain new and useful Improvements in the Mode of Picking and Dressing Millstones; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings and to the letters of reference marked thereon.

The nature of my invention may be thus describedyirst, I attach a bevel gear wheel to the mill spindle, which turns a pinion and shaft, to which, a cam is attached, and that operates and gives motion to the chisel, or other tool, which is used for furrowing mill stones. The chisel stock or arbor is attached to a perpendicular frame which contains the cam and the sto-p motion, and the chisel stock is so attached to the frame, that the depth of the chisel is gaged at every blow; the frame that contains the-chisel can be moved in any direction by the operator, so that he can dress mill stones with what is called sickle furrows or quarter-dress for threading or cracking. The direction of the chisel over and across the stone, is also moved by a screw, so that every line is alike, the chisel being forced down upon the stone by means of a spiral spring which operates on the arbor thatpasses down through a nut, by means of which, it can be lengthened or shortened, or turned in any direction, and the movement of the chisel is so arranged by the stop motion, that it can be stopped at any blow or instantly set in motion again, so that in dressing bur stones, it can be stopped and moved over the soft and porous parts, and retained on the harder ones, at the will of the operator.

When the machine is to be put in operation, place it upon the bed' stone, the machinery being attached to the spindle, it is at once set in motion by the power that operates the mill. The guards will assist the operator in doing his work in the nicest and the most expeditious manner.

To operate or dress the upper stone, or runner, the machine is moved from the bed lstone to the runner which may hang upon the bale, or may be placed upon blocks,-the motion, or power is transferred by two pulleysin a frame with a belt, one pulley being attached to the mill spindle, and the other to the machine.

. 11,686, dated September 19, 1854.

To enable others to understand the use of my invention, I will proceed to describe its construction and operation:

Figure 1, is a perspective View of the machine, the operations of which are particularly described in the following manner.

Letter A, represents the bed frame or basement which sits upon the mill-stone to be dressed; upon the center of the same is a perpendicular cylinder not seen in the drawings which is firmly attached to the .frame or basement aforesaid, about which, the cylinder B and the machinery, operating the machine, acts.

Letter C, represents the guides, as seen in. Figs. 2 and 3, which situpon the basement. In one end of each, there is a circular hole, marked r, and at the other end a projectiommarkcd s, and when either guide is to be used, the end containing the hole is screw attached to the bed frame marked I, hereafter described. This screw operates ,upon the projection on the guide, s, by means of a movable nut marked t, and the guide is also held in its place by this projection upon it, by the nut and screw, so as to give the furrows or threads their equal distance when cut upon the stone, Fig. 2 representing the guide for the sickle, and Fig. 3 representing that for the straight furrow.

'Letter D represents the slide as seen in Figs. 1 and l of the drawings, upon the end marked D of which is a firmly ixed frame work to hold the chisel-stock. This slide is moved upon the guide from the center to the circumference and back again as the operator may desire in dressing the stone, it being directed in its movements by a pin or projection marked fv, as fully seen in Fig. 6, unattached to the slide, near the outer edge of the frame work, which pin plays through the straight or circular slot as indicated by letter as seen in Figs. 2 and 3.

Letter E represents a revolving shaft and e a pinion, which being turned by a gear wheel F, resting upon the cylinder, gives motion to a cam I-I, and that operates and gives motion to the chisel u. The shaft at one end fits into the cam and at the other and that is connected to a horizontal square plate P, made exactly to lill the inner space placed upon the cylinder aforesaid, and it is moved horizontally backward and forj ward on the bed piece, by means of a` threadend into a vertical plate or journal box du.

of the slide in width; upon` the center ofY this square plate is an uprightcylinder just fitted to slip onto cylinder B on the frame, as

seen in Fig. 7. Thus' the slide is kept'in its g tion to the pinion and shaft as described in the preceding representation.

Letter G represents the frame and the upright stock or spindle attached to the slide as referred to in the representation in letter f D, as seen in Fig. 6. The upper end of the spindle is fitted in the frame, and it then passes down through a long nut c, and also through another transverse plate y, upon the upper end of the nut is a shank or project-ion m which the cam acts on, and gives motion to the spindle. The spindle is fur` ther constructed by means of a screw cut upon it so that by turning it in the nut c, the chisel at lower end is lowered or raised 'f i at pleasure, and any direction `required is gained. Upon the lower end of the spindle is a boss or -hub with a slot to receive the chisel or pick,'and they are fastened in with a set screw as seen in Fig. 6, letter z',- or the pick or chisel may be more easily and firmly fastened into the slot by means of two cheeks iixed 'on the outer edge of the slot whichr are pressed against the chisel or pick by a col# lar, having a screw on the upperrpart of it, l j

b e applied to the picking and dressing the 1'- which collar when screwed down vconfines the chisel 'or pick very firmly' inthe slot. Fig. 410 'represents the spindle out of the frame work. Fig. 11 represents the lower part of the spindle with the cheeks k Vand Z, t-he collar being off, andy Fig. '12 represpring n, which gives force to the chisel or f sents the lcollar by itself.

Letter H, represents the cam, which being turned strikes the projectionof the nut m, and raises up the spindle against aspiral pick. This spiral spring is upon the upper part of the spindle between' the nut and the upper part of the frame, and as Vthe spindle is raised by the cam passing under the project-ion of the nut, they spring forces down blow of the chisel or pick;on each side of the .spindle containing -the chiselv until 'it strikes a hubo or large projection on the spindle so as to gage the depth of every the frame are two horizontal handles a,

and .22, t9 move the slide containing the chisel or` pick back and forth from the center to the circumference. Handle a, is mov-V able, and when raised forces'a dog 7L, against the chisel-stock, so as to stop themovement ofthe chisel or pick, and by pressing the handle down againin its usual place'the spindle containing the chisel. or pick immediately commences its movements.

Letter I, represents a screw upon the framev which regulates and moves Ythe guide horizontally upon the frame for threading, or any other operation to be made upon the face ofthe stone to be dressedor picked.

Letter J lrepresents therrod stepand attachments as mostly seen in Fig. 8. The rod'passes up through the center of the cylinder of the gear wheel and is attached to the mill spindle so that the` gear wheel is vput in operation as soon [asthe motive power is applied to the mill. By means of this rod and attachment the frame or base-y andthe other to the rod passing through the cylinder of-the gear wheel, andthe machine is then placed uponthe stone to be dressed., and vthese pulleys are driven by the operation of the mill and the stone 'is dressed in the same manner as the bed or lower stone.V

`I `contemplate that my improvementsV may 1 various kinds of mill stones without further explanation, and that it may be modified in lvarious ways without departing from .Y the meritsofmy improvements, and alsor may ybe perhaps appliedto the -furrowing,vpick ing, and dressing of any stone by one or a gang ofv picks. Y y

What I claim as my invention and desire to secure by Letters Patent is Y .The guide (Figs. 2 and 3) with the nar-v row slot,y :zz in a straight line or such curve as is desired to give the furrow in which a projection from the frame, carrying the pick works, and by whichthe pickis guided, as it is drawn out to cut the furrow desired and this either with or without the thread- `screw I, by which said guide is movedv ra dially around the cylinder andy spindle. y

ELLIOT C. BADGER. Witnesses I f IIANNAH B. CARTER, STEPHEN C. BADGER.

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